Moldy bread
The ancient Egyptians treated some patients by eating moldy bread, and no one understood why until the year 1928, five thousand years later, modern science arrived if it was discovered by the scientist "Alexander Fleming" that penicillin had a great effect as an antibiotic on bacteria,
What is the relationship of bread to the subject?
The bread, when left to rot, produces a fungus called "Penicillium", from which it is derived penicillin, the most famous antibiotic used so far to treat some types of bacteria known to the Egyptians 5,000 years ago!